JP7420542B2 - Rotary drive control device, sheet processing device, and image forming device - Google Patents

Description

The present invention relates to a rotational drive control device, a sheet processing device, and an image forming device that have a function of extracting and specifying abnormal operation points from among a plurality of drive mechanisms and control units that control the drive mechanisms.

BACKGROUND ART Conventionally, in various devices including a plurality of drive mechanisms and drive members, when an abnormality occurs in operation, it has been difficult to quickly identify the location of the abnormality. For this reason, some of the various devices are equipped with an abnormality diagnosis function such as a sensor or a circuit for detecting an abnormality in operation, in addition to the normal operation mechanism, inside or outside the apparatus.

For example, an image forming apparatus equipped with multiple functions such as a copying machine and a scanner is equipped with a sheet processing apparatus that binds sheets on which images are formed and provides perforations at predetermined locations. is composed of various drive mechanisms and drive members. Among them is a punch unit that punches holes at predetermined locations on the sheet. In this punch unit, punch holes are formed by converting the rotational motion of the motor into linear reciprocating motion and passing a punching member having a circular blade at the tip through a predetermined location of the sheet. The mechanism includes a motor, a control unit that drives the motor, a cam member that is rotated by the motor, and a piercing member that is connected to the cam member. The cam member rotates in response to forward and reverse motions of the motor, thereby separating the punch blade from the sheet surface, and moving the punch blade between a home position, which is a reference for starting operation, and a punching operation position, where the sheet is punched. move back and forth. The cam member is provided with a home position detection sensor for detecting the home position and a phase detection sensor for detecting the position when drilling, and the rotation of the motor is controlled based on the output values of these sensors. be done.

In such a device, when moving from the home position to the drilling operation position, if the home position of the movement destination is not detected even after a preset time has elapsed, an error notification is sent. control. At that time, the maintenance personnel who maintain the punch unit performs repairs based on the error code notified in the error notification. In this way, service support is operated to restore the operation of the punch unit to its normal state.

When repairing a sheet processing device based on an error code, maintenance personnel must sequentially check on-site to see if any component related to the error code is malfunctioning and identify the malfunctioning part that requires repair. If the failure location is not quickly identified, a large amount of time will be required for repair, and the user will be inconvenienced during the repair. Therefore, in order to quickly restore the device, it is important to have a technique for identifying the failure location within the device in detail.

In Patent Document 1, in addition to a rotational state detection means that detects the rotational state of the motor, an intermediate potential detection means that detects an intermediate potential between each terminal potential of the motor and the low potential side potential of the motor drive power source. Abnormality detection means for detecting an abnormality in a drive circuit that drives a motor is disclosed.

Further, Patent Document 2 discloses means for identifying and detecting a motor disconnection by using a configuration in which the motor is connected to a power source via a resistor and the terminal voltage of the resistor is detected.

Japanese Patent Application Publication No. 2007-202259 Japanese Patent Application Publication No. 2007-330040

When operating the punch unit as described above, a motor and a drive circuit for driving the motor are used as its drive source. When identifying abnormalities in the operation of a device configured with a DC motor as a typical example of a motor and an H-bridge circuit (or a driver IC with a built-in H-bridge circuit) as a circuit for driving the DC motor, Patent Document 1 In this case, a circuit for detecting current is required separately from the drive circuit, and it is expected that the circuit will become more complicated due to an increase in the size of the board and the addition of components.

In addition, although the configuration of Patent Document 2 does not require a major addition to the configuration, it is only possible to detect disconnections, and it is difficult to identify the detailed location that is causing the error, so it is difficult to identify the detailed location that is causing the error. The problem is that it takes time.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention, in a configuration having a plurality of drive mechanisms and control units, detects an abnormal operation based on a detection combination pattern obtained when an abnormality occurs from a detection means that controls normal operation. An object of the present invention is to provide a rotational drive control device, a sheet processing device, and an image forming device that are equipped with a means for extracting and specifying a location where a problem occurs.

In order to solve the above problems, a rotational drive control device according to claim 1 of the present invention includes a motor that rotates in a first rotational direction and a second rotational direction opposite to the first rotational direction; a control section that drives and controls the motor; a mechanism section that includes a rotating member that rotates in response to the drive of the motor; a first detecting means that detects a first detecting section provided on the rotating member; a detecting section having a second detecting means for detecting a second detecting section different from the first detecting section provided on the rotating member, the control section controlling the motor to detect the rotating member. a first mode in which a detection value of the second detection means is counted based on a detection result of the first detection means obtained when the rotating member is rotated, and a movement amount of the rotation member is controlled ; a second mode for identifying at least one abnormal location from among the mechanism section and the detection section ; a first detection pattern consisting of a combination of a detection result obtained by the first detection means and a detection result obtained by the second detection means obtained when the motor is rotated in the first rotation direction; , a detection result obtained by the first detection means when the motor is rotated in the second rotation direction, and a detection result obtained when the motor is rotated in the second rotation direction. A second detection pattern consisting of a combination with a detection result by the detection means is used to identify the abnormal location in the second mode.

According to the rotational drive control device of the present invention, in addition to the first mode for performing normal drive control, there is also a function to extract an abnormal part when an abnormality occurs in the drive or control in the first mode. Since we have this in place, we can quickly and appropriately take actions such as confirming and recovering from abnormalities. Further, since the configuration for realizing the second mode is common to the configuration for the first mode, an increase in the number of parts and cost can be avoided.

1 is a cross-sectional view of a sheet processing apparatus equipped with a rotational drive control device of the present invention and an image forming apparatus equipped with the sheet processing apparatus. FIG. 2 is a cross-sectional view of the sheet processing apparatus. FIG. 2 is a schematic front view of a punch unit including a rotational drive control device. FIG. 3 is a schematic side view of the punch unit. FIG. 2 is a block diagram showing the configuration of a rotational drive control device. It is an H bridge circuit diagram. FIG. 6 is an explanatory diagram showing detection positions in one rotational direction of the first and second detection means. FIG. 7 is an explanatory diagram showing detection positions of the first and second detection means in other rotational directions. It is an operation timing chart in a 1st mode. FIG. 3 is an overall flow diagram of the second mode. It is a flowchart for extracting an abnormal location. FIG. 3 is a basic flow diagram for identifying an abnormal location. FIG. 3 is a first abnormality location identification flowchart. It is a 2nd abnormality location identification flowchart. It is a 3rd abnormality location identification flowchart. It is a 4th abnormality location identification flowchart. This is an anomaly extraction table based on combinations of detection patterns. This is an anomaly identification table based on combinations of detection patterns.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotational drive control device, a sheet processing device, and an image forming device using the same according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the overall configuration of an image forming apparatus A equipped with a sheet processing apparatus B, and FIG. 2 is a sectional view of the sheet processing apparatus B.

The image forming apparatus A, as shown in FIG. When the sheet processing device B is not installed, the image reading device 20 is arranged above the image forming section 2 as a paper discharge space. Therefore, when the sheet processing apparatus B is disposed, as shown in the figure, it is disposed on the apparatus frame 29 as a so-called in-body type that utilizes the above-mentioned sheet discharge space.

The image forming section 2 includes a photosensitive drum 3a composed of four color components (yellow Y, magenta M, cyan C, black BK), a charging device 4a composed of a charging roller that charges the photosensitive drum 3a, and an image reading device. It has an exposure device 5a which uses the image signal read by 20 as a latent image. Further, there is a developing device 6a that forms a latent image formed on the photosensitive drum 3a as a toner image, and a primary transfer roller 7a that primarily transfers the image on the photosensitive drum 3a formed by the developing device 6a onto the intermediate transfer belt 9. It is equipped with This configuration is primarily transferred onto the intermediate transfer belt 9 for each color component. The color components remaining on the photosensitive drum 3a are collected by the photosensitive cleaner 8a and prepared for the next image formation.

In the image reading device 20, the document placed on the document stacker 25 is sent to the platen 21 by the document feeder 24, and the sent document is irradiated by the scan unit 22, so that it is sequentially scanned by the photoelectric conversion element 23 (for example, CCD). The images are read and stored in a data storage unit (not shown).

The sheet processing apparatus B shown in FIG. 2 includes a conveyance unit 40 equipped with a shift roller unit 50 that receives the sheet discharged from the main body discharge roller 30 from the inlet 32, and a punch unit 60 that punches holes in the sheet. , a binding unit 100 is arranged that places temporary sheets on a processing tray 90 and performs binding processing. In the following description of this embodiment, unless otherwise specified, the direction in which the sheet is received from the main body ejection roller 30 into the conveyance unit 40 and conveyed toward the processing tray 90 will be referred to as the sheet conveyance direction.

Further, the sheet processing apparatus B has a first conveyance path 70 that leads to the processing tray 90 side, and a first conveyance path 70 that leads to the processing tray 90 side, downstream of the shift roller unit 50 in the sheet conveyance direction from the conveyance path 34 that guides the sheet from the conveyance entrance 32 Two transport paths 80 are provided. A first accumulation tray 110 is provided downstream of the first conveyance path 70 in the sheet conveyance direction and stores sheets discharged from the processing tray 90 or directly discharged from the first conveyance path 70. A second stacking tray 115 for storing sheets sent from the second conveyance path 80 as needed is arranged so as to overlap.

As shown in FIG. 2, the first stacking tray 110 is provided with a paper surface sensor 111S that detects the paper surface by bringing the stacking tray sensor 111 into contact with the top surface of the sheets stored therein. The elevating motor 110M is driven based on the paper surface level detected by the paper surface sensor 111S, so that the storage position is always within a certain range.

Note that a punch unit 60 for punching holes is arranged near the edge of the sheet (leading and trailing edges in the sheet conveying direction) constituting this sheet processing apparatus B, but this is not particularly applicable when punching holes in the sheet is not required. In this case, the punch unit 60 functions simply as a conveyance guide unit that guides the sheet.

Next, the punch unit 60 will be explained using the front view of FIG. 3 and the cross-sectional view of FIG. 4. The punch unit 60 includes a punch moving unit 61 having a punch blade 62 and a die hole 63, and a fixed part 69 having a waste box 67 and the like. The punch blade 62 is configured to reciprocate in the vertical direction shown in FIG. 4 by rotation of a rotating member (punch cam) 64 with respect to the die hole 63. The punch cam 64 includes a two-hole cam 64WC for punching two punch holes on both sides of the center of the sheet in the width direction of the sheet intersecting the sheet conveyance direction, and a two-hole cam 64WC for punching two holes at the center of the sheet and punching holes on both sides thereof. A three-hole cam 64TC is provided.

The rotation of a moving motor 61M provided on a fixed part 69 including a waste box 67 moves the punch moving unit 61 through a moving gear 61G so that the punch moving unit 61 can move in the width direction of the sheet that intersects with the sheet conveyance direction. It engages with a moving rack 66 fixed to. Accordingly, the punch moving unit 61 moves in the left-right direction of the arrow shown in FIG. 3 according to the forward and reverse driving of the moving motor 61M. In order to perform this movement smoothly, a moving roller 61R is provided between the punch moving unit 61 and the fixed part 69. As described above, the punch holes are provided with two punch blades 62WP for two holes and three punch blades 62TP for three holes, and corresponding die holes 63WD for two holes and die holes 63TD for three holes. There is.

As shown in FIGS. 3 and 4, the two-hole cam 64WC and the three-hole cam 64TC are provided so as to have different phases. This punch cam 64 is driven by a brushed DC motor (motor) 60M via a punch gear 65, and an eccentric cam 64C is rotated by a cam drive shaft 64J by switching the rotation direction of the motor 60M between the rotation direction of arrow a and the rotation direction of b. is rotated, and a cam holder 64H provided on the outside thereof and connected to the punch blade 62 is moved. At this time, since the cam phases are different, it is possible to switch between the two-hole punch blade 62WP and the three-hole punch blade 62TP.

As shown in FIG. 3, side edge sensors 61S are provided on the opposite side of the motor 60M of the punch moving unit 61 across the sheet path, depending on the sheet size. This side edge sensor 61S detects the edge in the width direction of the sheet at a position near the rear end of the sheet in the sheet conveyance direction, and the punch moving unit 61 is moved slightly from the outside to the inside of the edge in the width direction of the sheet. The position of two or three holes is determined by detecting the edge of the sheet based on a change in the state of the sensor (falling or rising). Further, a punch sensor 60S is provided at a position corresponding to the widthwise center of the sheet (the center of the three-hole punch blade 62TP) to detect the end of the sheet in the conveyance direction. The position where the rear end of the sheet in the transport direction passes through this punch sensor 60S is determined to be the perforation position of the sheet. Of course, the punching position may be determined by a predetermined count from the punch sensor 60S.

FIG. 5 shows the system configuration of the rotational drive control device 10 mounted on the punch unit 60. The rotational drive control device 10 includes a motor 60M, a control section 11 having a control means for driving and controlling the motor 60M, a mechanism section 12 having a punch cam 64 that rotates under the drive of the motor 60M, and a punch blade 62 that is interlocked with the punch cam 64. The detection section 13 includes a first detection means 14 for detecting a rotational reference position P1a of the punch cam 64 and a second detection means 15 for detecting a rotational movement position P1b of the punch cam 64.

The control unit 11 includes a CPU 16, a memory 17, a control circuit 18, an H-bridge circuit 19, and control means for controlling these, and the rotation of the motor 60M is controlled by this control means. The control means of the present invention counts the detection value of the second detection means 15 based on the detection value of the first detection means 14 obtained when controlling and rotating the motor 60M, and moves the punch cam 64. A first mode in which a normal drilling operation is performed by controlling the amount, and a first detection means 14 obtained when the motor 60M is controlled and rotated detects the rotation reference position P1a within a predetermined time. Based on a detection pattern consisting of a combination of the state or non-detection state and the state in which the second detection means 15 detects or does not detect the rotational movement position P1b within a predetermined time, the motor 60M controls the abnormal location. 11, a mechanism section 12, a second mode in which at least one of the first detection means and the second detection means 15 is extracted.

FIG. 6 shows the configuration of the H-bridge circuit 19. This H-bridge circuit 19 is composed of four switches (transistors) Tr, and Tr1, Tr2, Tr3, and Tr4 are connected to both terminals of a coil 60C of a motor 60M. The CPU 16 sends a control signal IN1 (H: ON/L: OFF) to the control circuit 18 for controlling the on/off of the motor 60M, and a control signal IN2 (H: positive) for controlling the rotation direction of the motor 60M. Rotation of the motor 60M is controlled by inputting rotation (CW)/L:reverse rotation (CCW).

7A and 7B show the detection operation in the detection unit 13. The detection unit 13 includes a first detection means 14 and a second detection means 15, and is arranged around the drive shaft 64J of the punch cam 64. The first and second detection means 14 and 15 include first and second detection members 14b and 15b in a disc shape that rotate together with the drive shaft 64J, and first and second photosensors 14a such as photointerrupters. , 15a.

The first detected member 14b is arranged around the drive shaft 64J, the second detected member 15b is arranged outside the first detected member 14b, and each detected member is integrated with the drive shaft 64J. Rotate around the center. The first detected member 14b is provided with a first slit 14c through which light passes in directions 180 degrees opposite to each other with the drive shaft 64J in between. This first slit 14c serves as a flag for detecting the rotation reference position P1a of the punch cam 64. Further, the second detected member 15b is provided with a plurality of second slits 15c through which light passes along the direction of rotation about the drive shaft 64J. This second slit 15c serves as a flag for detecting the rotational movement position P1b of the punch cam 64.

The first photosensor 14a detects the rotation reference position P1a of the punch cam 64 by detecting light blocking (H) and light transmission (L) at each edge of the first slit 14c. On the other hand, the second photosensor 15a detects the rotational movement position P1b of the punch cam 64 by detecting light blocking (H) and light transmission (L) at each edge of the second slit 15c. The second photosensor 15a detects the rotational movement position P1b of the punch cam 64 by following the plurality of second slits 15c. Since the second detected member 15b shown in this embodiment has 40 second slits 15c, 80 edges can be used as detection changes by the second photosensor 15a. The detection resolution of the second photosensor 15a in the second mode described below needs to be 1/2 or less of the detection resolution of the first photosensor 14a. In order to achieve this detection resolution, it is sufficient to provide a second slit 15c every 90 degrees with respect to a pair of first slits 14c provided in the first detected member 14b. The slits at 40 locations have sufficient resolution. In this embodiment, a photosensor is used as a non-contact sensor, but an inductive proximity sensor or the like may be used, and the type of sensor is not limited.

Next, a series of punching operations (first mode) in the punch unit 60 will be described with reference to FIGS. 5, 7A, 7B, and 8. First, the first detection means 14 detects one rotational reference position P1a of the punch cam 64 via the first photosensor 14a and the first slit 14c (FIG. 7A(a)). If the first photosensor 14a and the first slit 14c are in an overlapping position at the beginning of detection, the light from the first photosensor 14a is in a transparent state. In this transparent state, the punch cam 64 is at the rotation reference position P1a, and the punch blade 62 has a perforated hole whose tip is retracted a predetermined amount upward from the conveyance path 35 of the sheet S, as shown in FIG. It is in the retreat position P2a. In this state, the motor 60M is rotated in either rotational direction 1 (CW) or rotational direction 2 (CCW), and when any edge of the first slit 14c is detected, the motor 60M is stopped. Furthermore, when the motor 60M is rotated CW or CCW which was rotated just before, and the edge of the first detected member 14b switching from the light-shielding part (the part excluding the first slit 14c) to the first slit 14c is detected, Stop motor 60M again. If the light shielding portions of the first photosensor 14a and the first detected member 14b overlap at the initial stage of detection, the motor 60M is rotated in either the CW or CCW direction, and the first photosensor 14a is rotated from the light shielding portion to the first When the edge switching to the slit 14c is detected, the motor 60M is stopped again. In either case, the first photosensor 14a remains in a position where light is transmitted, and the operation of the motor 60M is put on standby. Thereafter, when the punch sensor 60s (see FIG. 4) detects the trailing end of the conveyed sheet in the sheet conveyance direction, the sheet is stopped at the punching position.

After stopping the sheet at the perforation position, Tr1 and Tr4 of the H-bridge circuit 19 shown in FIG. 6 are turned on to rotate the motor 60M in the CW direction. After the second detection means 15 detects a predetermined number of pulses, Tr1 is turned OFF and TR3 is turned ON, thereby transitioning to a braking operation. The rotational movement position P1b shown in FIG. 7A(b) is the starting position of the braking operation. At this time, the punch blade 62 moves to the punching operation position P2b where the sheet S is punched, as shown in FIG. After the brake operation, the motor 60M overruns by a predetermined amount, and the punch cam 64 stops at the other rotation reference position P1a on the opposite side by 180 degrees (FIG. 7A(c)). Specifically, when the motor 60M is rotated and the first photosensor 14a detects the edge of switching from the first slit 14c to the light shielding section, the second detection means 15 starts counting pulses. When the first photosensor 14a rotates 100 degrees from the position where the edge is detected (FIG. 7A(b)), the brake operation is started by turning OFF Tr1 and turning ON TR3. After the brake operation, the punch unit 60 overruns by 65 degrees due to inertia and stops at the other rotation reference position P1a on the opposite side by 180 degrees (FIG. 7A(c)). At the other rotation reference position P1a, the first photosensor 14a remains in the position where light is transmitted, and the operation of the motor 60M is kept on standby.

When the perforation operation is completed, the previous perforated sheet is discharged downstream in the sheet conveyance direction, and the next sheet is guided to the perforation position and stopped. Then, Tr2 and Tr3 of the H-bridge circuit 19 are turned on to rotate the motor 60M in the CCW direction (FIG. 7B(d)). Then, in the second detection means 15, after detecting a predetermined pulse, Tr2 is turned OFF and Tr3 is turned ON, and when the rotational movement position P1b reaches the position shown in FIG. 7B(e), the brake operation is started. After the brake operation, the motor 60M overruns by a predetermined amount, so that the punch cam 64 stops at the other rotation reference position P1a on the opposite side by 180° (FIG. 7B(f)). As mentioned above, with respect to the punch cam 64, the two-hole cam 64WC and the three-hole cam 64TC are provided with different phases, so when punching holes in two places on the sheet, , the motor 60M is controlled to alternately rotate CW and CCW.

Next, the second mode of the control means will be explained. As described above, this second mode includes a state in which the first detection means 14 obtained when controlling and rotating the motor 60M detects or does not detect the rotation reference position P1a within a predetermined time; Based on a detection pattern consisting of a combination of a state in which the second detection means 15 detects the rotational movement position P1b within a predetermined time or a state in which it does not detect the rotational movement position P1b, an abnormal location is detected in the motor 60M, the control unit 11, the mechanism unit 12, At least one of the detection units 13 (first detection means 14 and second detection means 15) is extracted.

FIG. 9 shows the overall flow in the second mode. This second mode is activated when the motor 60M is driven and a normal drilling operation does not start within a preset predetermined time. When the second mode is activated, the motor 60M is driven to rotate in the same direction as the rotation direction (rotation direction 1) at the time of first activation (S10). Then, when it is confirmed that the motor 60M has stopped (S11), the rotational reference position P1a and rotational movement position P1b of the punch cam 64 at that time are detected by the first and second detection means 14 and 15 (S12). The data obtained by this detection is stored in the memory 17 as a first detection value. The memory 17 stores in advance an abnormality extraction table based on combination patterns of detection values of the first and second detection means 14 and 15, as shown in FIG. Compare the detection results (first detection values) from the first and second detection means 14 and 15 obtained when the motor 60M is rotationally driven in the rotational direction 1 with the abnormality extraction table shown in FIG. By doing so, it is possible to extract a location where an abnormality is estimated to have occurred.

Next, the motor 60M is rotated in a rotational direction 2 opposite to the rotational direction 1 (S13). Then, when it is confirmed that the motor 60M has stopped (S14), the rotational reference position P1a and rotational movement position P1b of the punch cam 64 at that time are detected by the first and second detection means (S15). The data obtained by this detection is stored in the memory 17 as a second detected value. As described above, the memory 17 stores in advance an abnormality extraction table based on the combination pattern of the detection values of the first and second detection means 14 and 15, as shown in FIG. Compare the detection results (second detection values) from the first and second detection means 14 and 15 obtained when the motor 60M is rotationally driven in the rotational direction 2 with the abnormality extraction table shown in FIG. By doing so, it is possible to extract locations where an abnormality is presumed to have occurred.

Furthermore, the memory 17 is configured to select one of the motor 60M, the control section 11, the mechanism section 12, and the detection section 13 based on the first and second detected values stored in the memory 17, as shown in FIG. An abnormality identification table for identifying abnormal locations is stored in advance. By comparing the first and second detection values obtained by rotationally driving the motor 60M in the rotational direction 1 and the rotational direction 2 with the abnormality identification table, the motor 60M, the control section 11, the mechanism section 12, and the detection section are detected. 13 where the abnormality is occurring can be identified (S16). By comparing the detected values of the first and second detection means 14 and 15 obtained by rotating the motor 60M in either direction with the abnormality extraction table, locations where an abnormality may occur are extracted. However, by comparing the combination of detection values of the first and second detection means 14 and 15 obtained by rotating the motor 60M in different directions with the abnormality identification table, the abnormality can be more clearly identified. can be specified. Note that if an abnormal location cannot be identified from the combination of the above detected values, it will not be subject to abnormality diagnosis.

When configured with a DC motor (motor) 60M as a drive source for driving the mechanism section 12, and an H-bridge circuit 19 using a transistor or FET as a drive circuit for driving the motor 60M, the motor 60M is bidirectionally connected to the coil 60C of the motor 60M. By passing a current, rotational operations in CW (rotation direction 1) and CCW (rotation direction 2) are performed. In this case, since the states of the transistors Tr1 to Tr4 of the H-bridge circuit 19, which are turned ON/OFF to switch the rotation direction of the motor 60M, are different, the first and second detection means 14, which can be obtained by rotation in only one direction, An abnormality in the control unit 11 including the H-bridge circuit 19 cannot be accurately identified using only the detection results from the H-bridge circuit 15 . For example, as in pattern 3 shown in FIG. 16, from the rotation results in one direction, a plurality of locations where an abnormality is estimated to have occurred are extracted, including the detection section 13 and the mechanism section 12. On the other hand, by comparing the detection results in both rotational directions 1 and 2, it is possible to separately identify the mechanical part 12 and the detection part 13 as abnormal locations, as shown in the row of pattern 23 shown in FIG. It becomes possible to specify.

In the above, the second mode is assumed to be activated when the motor 60M is driven by the first mode and normal drilling operation does not start within a preset predetermined time, that is, when some abnormal operation occurs. As explained above, since the second mode is operating in parallel with the normal control in the first mode, it is detected that a normal drilling operation has not started within a predetermined time and that an abnormality has occurred. At the same time, it is also possible to identify abnormal locations.

FIG. 10 shows a detailed flow of step (S12) in FIG. Here, the detection value of the first detection means 14 changes from L to H within a predetermined time or does not change, and the detection value of the second detection means changes within a predetermined time or does not change. Look at Taka. In the detailed flow of FIG. 9, in order to make it easier to see the branching to each pattern, the process is shown as proceeding to step S22 or step S23 after the judgment in step S21, but the actual detection monitoring and judgment are performed in the first step. The detection means 14 and the second detection means 15 are performed individually. In the first mode described above, the detection pulses of the second detection means 15 are counted based on the detection of the first detection means 14. In other words, the detection value from the second detection means 15 is not used until the first detection means 14 is detected. On the other hand, in the second mode, the detection values of the first detection means 14 and the second detection means 15 are individually stored in the memory and compared with a pre-stored abnormality extraction table. Thereby, the first detection means 14 and the second detection means 15 can be determined individually. If the first detection means 14 detects within a predetermined time and the detected value of the second detection means 15 changes within the predetermined time, pattern 1 is established, and the first and second detection means 14, 15 , motor 60M, control section 11, and mechanism section 12 are determined to have no abnormality. On the other hand, if the first detection means 14 is detected within a predetermined time and the detection value of the second detection means 15 does not change within the predetermined time, pattern 2 occurs, and there is an abnormality in the second detection means 15. It is determined that (see FIG. 16).

If the detected value by the first detecting means 14 is not detected within the predetermined time and the detected value by the second detecting means 15 changes within the predetermined time, pattern 3 occurs, and the first detecting means 14 , it is determined that there is an abnormality in the mechanism section 12. On the other hand, if the detected value in the first detecting means 14 is not detected within the predetermined time and the detected value in the second detecting means 15 does not change within the predetermined time, pattern 4 occurs, and the motor 60M, the control unit 11, it is determined that there is an abnormality in either of the mechanical parts 12 (see FIG. 16). The above-mentioned predetermined time period corresponds to the time for rotating the punch cam 64 by 180 degrees since the first slits 14c are provided in directions 180 degrees opposite to each other with the drive shaft 64J of the punch cam 64 interposed therebetween. The second detection means 15 having a higher detection resolution (more than double) than the first detection means 14 may set the predetermined time required for detection to 1/2 or less of that of the first detection means 14. However, since it is necessary to wait for the detection result of the first detection means 14, it may be set to the same time as the first detection means 14.

11 to 15 show the detailed flow of step (S16) in FIG. 9. In the following description, the detection patterns in rotation direction 1 are assumed to be patterns 11 to 14, and the detection patterns in rotation direction 2 are assumed to be patterns 21 to 24.

In FIG. 11, it is determined which of patterns 11 to 14 the first detection pattern in rotation direction 1 is in (S30, S40, S50, S60). If it is pattern 11, there is a possibility that it is not an abnormality but an accidental error, so it is determined that there is no abnormality. In the case of pattern 12, it can be extracted from the detection pattern that there is a possibility that the abnormal location is the second detection means 15. In the case of pattern 13, it can be extracted from the detection pattern that the abnormal location may be the first detection means 14 or the mechanical part 12 such as the punch blade 62 or punch cam 64. In the case of pattern 14, it can be extracted from the detection pattern that there is a possibility that the abnormal location is in the mechanism section 12, the motor 60M, or the control section 11.

FIG. 12 is a flowchart when the first detection pattern in rotation direction 1 is pattern 11 in step (S30) of FIG. Here, first, it is determined whether the second detection pattern in rotation direction 2 is pattern 22 (S31). If it is pattern 22, it is determined that the sensor is not subject to abnormality diagnosis because it is an unlikely sensor state.
Returning to step (S31), if the pattern is not 22, it is determined whether the pattern is 21 (S32). If it is pattern 21, there is a possibility that it is not an abnormality but an accidental error, so it is determined that there is no abnormality.
Returning to step (S32), if the pattern is not 21, it is determined whether the pattern is 23 (S33). In the case of pattern 23, it can be determined that the mechanical part 12 such as the punch blade 62 and punch cam 64 is abnormal.
Returning to step (S33), if it is not the pattern 23, it can be identified as the mechanism section 12 such as the punch blade 62 or the punch cam 64 or the control section 11.

FIG. 13 is a flowchart when the first detection pattern in rotation direction 1 is pattern 12 in step (S40) in FIG. Here, first, it is determined whether the second detection pattern in rotation direction 2 is pattern 22 (S41). If it is pattern 22, it can be specified that the abnormal location is the second detection means. On the other hand, if it is not pattern 22, it is determined that the sensor state is not subject to abnormality diagnosis because it is an unlikely sensor state.

FIG. 14 is a flowchart when the first detection pattern in rotation direction 1 is pattern 13 in step (S50) of FIG. Here, it is first determined whether the second detection pattern in rotation direction 2 is pattern 21 (S51). In the case of pattern 21, it can be determined that the abnormal location is the mechanism section 12.
Returning to step (S51), if pattern 21 is not detected, it is determined whether the second detected pattern in rotation direction 2 is pattern 23 (S52). In the case of pattern 23, it can be specified that the abnormal location is the first detection means 14. On the other hand, if it is not pattern 23, it is determined that the sensor state is not subject to abnormality diagnosis because it is an unlikely sensor state.

FIG. 15 is a flowchart when the first detection pattern in rotation direction 1 is pattern 14 in step (S60) in FIG. Here, first, it is determined whether the second detection pattern in rotation direction 2 is pattern 21 (S61). In the case of pattern 21, it can be determined that the abnormal location is the mechanism section 12 or the control section 11. If the first detection pattern in rotation direction 1 is pattern 14, it is extracted that the abnormal location may be the mechanism section 12, motor 60M, or control section 11. However, in the case of the H-bridge circuit 19, even if there is an abnormality in one of the transistors, rotational drive is possible in either direction. If there is no abnormality in the means 15, a detection value is detected by either detection means. As a result, the motor 60M is removed from the location where the abnormality may have occurred, and the abnormality location is identified as the mechanism section 12 or the control section 11. Returning to step (S61), if pattern 21 is not detected, it is determined whether the second detected pattern in rotation direction 2 is pattern 24 (S62). In the case of pattern 24, it can be determined that the abnormal location is in the mechanism section 12, the motor 60M, or the control section 11. On the other hand, if it is not pattern 24, it is determined that the sensor state is not subject to abnormality diagnosis because it is an unlikely sensor state.

As described above, the determination results based on the first and second detection patterns (FIGS. 16 and 17) are displayed on the operation display section 120 ( (See FIG. 1), it is possible to respond quickly and appropriately when an abnormality occurs. In addition, by notifying the service center, etc. in charge of maintenance of the determination result using the Internet or telephone line, maintenance personnel who maintain the device can be informed of the parts in which the abnormality is occurring, reducing the time required for repair. can do.

In the present embodiment, the punch unit 60 that punches holes in a sheet on which an image is formed has been described as an example of a configuration driven by the rotational drive control device 10, but the punch unit 60 is not limited to such a configuration. Instead, it may be a sheet conveyance unit that conveys the sheet using forward and reverse rotation of a motor, or a sheet shift unit that shifts the sheet in the sheet width direction that intersects the sheet conveyance direction. In addition, although the embodiment has been described with a configuration in which the rotational drive control device 10 mounted on the punch unit 60 has the control section 11, the control section 11 is installed in the sheet processing device B or the image forming apparatus A equipped with the sheet processing device B. may be placed.

S sheet P1a Rotation reference position P1b Rotation movement position P2a Drilling retreat position P2b Drilling operation position 10 Rotary drive control device 11 Control section 12 Mechanism section 13 Detection section 14 First detection means 14a First photosensor 14b First detected object Member 14c First slit 15 Second detection means 15a Second photosensor 15b Second detected member 15c Second slit 16 CPU
17 Memory 18 Control circuit 19 H-bridge circuit 20 Image reading device 21 Platen 22 Scan unit 25 Original stacker 29 Device frame 30 Main body ejection roller 32 Carrying inlet 34 Carrying path 35 Conveying path 40 Conveying unit 50 Shift roller unit 60 Punch unit 60C Coil 60M Motor 60S Punch sensor 61 Punch moving unit 62 Punch blade 63 Die hole 64 Punch cam (rotating member)
64J Drive shaft 65 Punch gear 66 Movable rack 67 Waste box 69 Fixed part 70 First conveyance path 80 Second conveyance path 90 Processing tray 100 Binding unit 110 First accumulation tray 111 Accumulation tray sensor 115 Second accumulation tray 120 Operation display section

Claims (14)

a motor rotating in a first rotational direction and a second rotational direction opposite to the first rotational direction;
a control unit that drives and controls the motor;
a mechanism section having a rotating member that rotates when driven by the motor;
It has a first detecting means for detecting a first detecting section provided on the rotating member, and a second detecting means for detecting a second detecting section different from the first detecting section provided on the rotating member. comprising a detection section;
The control unit counts the detection value of the second detection means based on the detection result of the first detection means obtained when the motor is controlled to rotate the rotation member, and a first mode for controlling the amount of movement of the controller, and a second mode for identifying at least one abnormal location from among the control section, the mechanism section, and the detection section;
The control unit includes:
A detection result by the first detection means obtained when the motor is rotated in the first rotation direction, and a detection result obtained when the motor is rotated in the first rotation direction. a first detection pattern consisting of a combination with the detection result of the means;
A detection result obtained by the first detection means when the motor is rotated in the second rotation direction, and a detection result obtained when the motor is rotated in the second rotation direction. and a second detection pattern formed by a combination of detection results obtained by the means . The rotational drive control device according to claim 1 , wherein the control unit executes the second mode when an operational abnormality occurs in the first mode. The control unit stores the first detection pattern and the second detection pattern, and detects an abnormal location based on a comparison between a pre-stored combination of the first detection pattern and the second detection pattern. The rotational drive control device according to claim 1 or 2, wherein the rotational drive control device is specified from among the motor, the control section, the mechanism section, and the detection section. In the second mode , the control unit :
When the motor is rotated in the first rotation direction, the first detection means detects the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. detecting the second detection unit ;
When the motor is rotated in the second rotation direction, the first detection means does not detect the first detection part within a predetermined time, and the second detection means does not detect the first detection part within a predetermined time. When the second detection unit is detected,
The rotational drive control device according to any one of claims 1 to 3 , characterized in that the mechanism section is specified as an abnormal location. In the second mode , the control unit :
When the motor is rotated in the first rotation direction, the first detection means detects the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. detecting a second detection section ;
When the motor is rotated in the second rotation direction, the first detection means does not detect the first detection part within a predetermined time and the second detection means detects the first detection part within a predetermined time. When the second detection unit is not detected,
The rotational drive control device according to any one of claims 1 to 4, characterized in that the mechanism section or the control section is specified as an abnormal location. In the second mode , the control unit :
When the motor is rotated in the first rotation direction, the first detection means detects the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. without detecting the second detection unit;
When the motor is rotated in the second rotation direction, the first detection means detects the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. When the second detection section is detected,
The rotational drive control device according to any one of claims 1 to 5, characterized in that said second detection means is specified as an abnormal location. In the second mode , the control unit :
When the motor is rotated in the first rotation direction, the first detection means does not detect the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. detecting the second detection unit ;
When the motor is rotated in the second rotation direction, the first detection means detects the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. When the second detection section is detected,
The rotational drive control device according to any one of claims 1 to 6, characterized in that the mechanism section is identified as an abnormal location. In the second mode , the control unit :
When the motor is rotated in the first rotation direction, the first detection means does not detect the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. detecting the second detection unit ;
When the motor is rotated in the second rotation direction, the first detection means does not detect the first detection part within a predetermined time, and the second detection means does not detect the first detection part within a predetermined time. When the second detection unit is detected,
The rotational drive control device according to any one of claims 1 to 7, characterized in that the first detection means is identified as an abnormal location. In the second mode , the control unit :
When the motor is rotated in the first rotation direction, the first detection means does not detect the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. not detecting the second detection unit ;
When the motor is rotated in the second rotation direction, the first detection means detects the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. 9. The rotational drive control device according to claim 1 , wherein when the second detection section is detected, the mechanism section or the control section is identified as an abnormal location. In the second mode , the control unit :
When the motor is rotated in the first rotation direction, the first detection means does not detect the first detection part within a predetermined time, and the second detection means detects the first detection part within a predetermined time. not detecting the second detection unit ;
When the motor is rotated in the second rotation direction, the first detection means does not detect the first detection part within a predetermined time, and the second detection means does not detect the first detection part within a predetermined time. The rotational drive control device according to any one of claims 1 to 9, characterized in that when the second detection unit is not detected, the motor, the mechanism unit, or the control unit is identified as an abnormal location. . The first detection means has a first photosensor,
The second detection means has a second photosensor,
The first detection unit has a plurality of first slits formed along a rotation direction in which the rotation member rotates,
11. Any one of claims 1 to 10 , wherein the second detection section has a plurality of second slits formed along the rotation direction at a period finer than the period of the first slit. The rotational drive control device described in 2 . The mechanism unit includes a punch blade that perforates the sheet , and the rotating member that rotates by rotation of the motor in the first mode to perform perforation processing by the punch blade. The sheet processing apparatus according to any one of Items 1 to 11 . The sheet processing apparatus according to any one of claims 1 to 11, wherein the mechanism section includes a conveyance unit that conveys the sheet by being rotated by the rotation of the motor in the first mode. an image forming unit that forms an image on a sheet;
An image forming apparatus comprising: the sheet processing apparatus according to claim 12 or 13 , wherein the sheet processing apparatus executes processing on a sheet on which an image is formed by the image forming unit.

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